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-rw-r--r--generic/tclIOUtil.c113
1 files changed, 83 insertions, 30 deletions
diff --git a/generic/tclIOUtil.c b/generic/tclIOUtil.c
index e3c5816..0600a6c 100644
--- a/generic/tclIOUtil.c
+++ b/generic/tclIOUtil.c
@@ -39,9 +39,10 @@ static void FsAddMountsToGlobResult(Tcl_Obj *resultPtr,
Tcl_GlobTypeData *types);
static void FsUpdateCwd(Tcl_Obj *cwdObj, ClientData clientData);
-#ifdef TCL_THREADS
static void FsRecacheFilesystemList(void);
-#endif
+static void Claim(void);
+static void Disclaim(void);
+
/*
* These form part of the native filesystem support. They are needed here
@@ -583,34 +584,41 @@ TclFSCwdPointerEquals(
}
}
-#ifdef TCL_THREADS
static void
FsRecacheFilesystemList(void)
{
ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&tclFsDataKey);
- FilesystemRecord *fsRecPtr, *tmpFsRecPtr = NULL;
+ FilesystemRecord *fsRecPtr, *tmpFsRecPtr = NULL, *chain = NULL;
/*
* Trash the current cache.
*/
fsRecPtr = tsdPtr->filesystemList;
- while (fsRecPtr != NULL) {
- tmpFsRecPtr = fsRecPtr->nextPtr;
- if (--fsRecPtr->fileRefCount <= 0) {
- ckfree((char *)fsRecPtr);
+ if (tsdPtr->claims <= 0) {
+ while (fsRecPtr != NULL) {
+ tmpFsRecPtr = fsRecPtr->nextPtr;
+ if (--fsRecPtr->fileRefCount <= 0) {
+ ckfree((char *)fsRecPtr);
+ }
+ fsRecPtr = tmpFsRecPtr;
}
- fsRecPtr = tmpFsRecPtr;
+ } else {
+ chain = fsRecPtr;
+ while (fsRecPtr->nextPtr != NULL) {
+ fsRecPtr->prevPtr = fsRecPtr->nextPtr;
+ fsRecPtr->nextPtr = NULL;
+ fsRecPtr = fsRecPtr->prevPtr;
+ }
+ fsRecPtr->prevPtr = fsRecPtr;
}
tsdPtr->filesystemList = NULL;
/*
- * Code below operates on shared data. We are already called under mutex
- * lock so we can safely proceed.
- *
* Locate tail of the global filesystem list.
*/
+ Tcl_MutexLock(&filesystemMutex);
fsRecPtr = filesystemList;
while (fsRecPtr != NULL) {
tmpFsRecPtr = fsRecPtr;
@@ -626,13 +634,13 @@ FsRecacheFilesystemList(void)
tmpFsRecPtr = (FilesystemRecord *) ckalloc(sizeof(FilesystemRecord));
*tmpFsRecPtr = *fsRecPtr;
tmpFsRecPtr->nextPtr = tsdPtr->filesystemList;
- tmpFsRecPtr->prevPtr = NULL;
- if (tsdPtr->filesystemList) {
- tsdPtr->filesystemList->prevPtr = tmpFsRecPtr;
- }
+ tmpFsRecPtr->prevPtr = chain;
+ chain = NULL;
tsdPtr->filesystemList = tmpFsRecPtr;
fsRecPtr = fsRecPtr->prevPtr;
}
+ tsdPtr->filesystemEpoch = theFilesystemEpoch;
+ Tcl_MutexUnlock(&filesystemMutex);
/*
* Make sure the above gets released on thread exit.
@@ -643,27 +651,16 @@ FsRecacheFilesystemList(void)
tsdPtr->initialized = 1;
}
}
-#endif /* TCL_THREADS */
static FilesystemRecord *
FsGetFirstFilesystem(void)
{
ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&tclFsDataKey);
- FilesystemRecord *fsRecPtr;
-#ifndef TCL_THREADS
- tsdPtr->filesystemEpoch = theFilesystemEpoch;
- fsRecPtr = filesystemList;
-#else
- Tcl_MutexLock(&filesystemMutex);
if (tsdPtr->filesystemList == NULL
|| (tsdPtr->filesystemEpoch != theFilesystemEpoch)) {
FsRecacheFilesystemList();
- tsdPtr->filesystemEpoch = theFilesystemEpoch;
}
- Tcl_MutexUnlock(&filesystemMutex);
- fsRecPtr = tsdPtr->filesystemList;
-#endif
- return fsRecPtr;
+ return tsdPtr->filesystemList;
}
/*
@@ -675,9 +672,48 @@ int
TclFSEpochOk(
int filesystemEpoch)
{
+ return (filesystemEpoch == theFilesystemEpoch);
+}
+
+static void
+Claim()
+{
+ ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&tclFsDataKey);
+
+ tsdPtr->claims++;
+}
+
+static void
+Disclaim()
+{
ThreadSpecificData *tsdPtr = TCL_TSD_INIT(&tclFsDataKey);
- (void) FsGetFirstFilesystem();
- return (filesystemEpoch == tsdPtr->filesystemEpoch);
+ FilesystemRecord *fsRecPtr, *toRelease, *lastCurrent;
+
+ if (--tsdPtr->claims > 0) {
+ return;
+ }
+ fsRecPtr = tsdPtr->filesystemList;
+
+ /*
+ * Release all out of date FilesystemRecords.
+ * First skip the current list.
+ */
+ while (fsRecPtr->nextPtr != NULL) {
+ fsRecPtr = fsRecPtr->nextPtr;
+ }
+
+ /* Then release everything that comes after. */
+ lastCurrent = fsRecPtr;
+ toRelease = lastCurrent->prevPtr;
+ lastCurrent->prevPtr = NULL;
+ while (toRelease != NULL) {
+ fsRecPtr = (toRelease == toRelease->prevPtr) ? NULL
+ : toRelease->prevPtr;
+ if (--toRelease->fileRefCount <= 0) {
+ ckfree((char *)toRelease);
+ }
+ toRelease = fsRecPtr;
+ }
}
/*
@@ -798,6 +834,7 @@ TclFinalizeFilesystem(void)
}
fsRecPtr = tmpFsRecPtr;
}
+ theFilesystemEpoch++;
filesystemList = NULL;
/*
@@ -835,6 +872,7 @@ void
TclResetFilesystem(void)
{
filesystemList = &nativeFilesystemRecord;
+ theFilesystemEpoch++;
/*
* Note, at this point, I believe nativeFilesystemRecord -> fileRefCount
@@ -1422,6 +1460,7 @@ TclFSNormalizeToUniquePath(
firstFsRecPtr = FsGetFirstFilesystem();
+ Claim();
fsRecPtr = firstFsRecPtr;
while (fsRecPtr != NULL) {
if (fsRecPtr->fsPtr == &tclNativeFilesystem) {
@@ -1454,6 +1493,7 @@ TclFSNormalizeToUniquePath(
}
fsRecPtr = fsRecPtr->nextPtr;
}
+ Disclaim();
return startAt;
}
@@ -2648,6 +2688,7 @@ Tcl_FSGetCwd(
*/
fsRecPtr = FsGetFirstFilesystem();
+ Claim();
while ((retVal == NULL) && (fsRecPtr != NULL)) {
Tcl_FSGetCwdProc *proc = fsRecPtr->fsPtr->getCwdProc;
if (proc != NULL) {
@@ -2685,6 +2726,7 @@ Tcl_FSGetCwd(
}
Tcl_DecrRefCount(retVal);
retVal = NULL;
+ Disclaim();
goto cdDidNotChange;
} else if (interp != NULL) {
Tcl_AppendResult(interp,
@@ -2697,6 +2739,7 @@ Tcl_FSGetCwd(
}
fsRecPtr = fsRecPtr->nextPtr;
}
+ Disclaim();
/*
* Now the 'cwd' may NOT be normalized, at least on some platforms.
@@ -3642,6 +3685,7 @@ Tcl_FSListVolumes(void)
*/
fsRecPtr = FsGetFirstFilesystem();
+ Claim();
while (fsRecPtr != NULL) {
Tcl_FSListVolumesProc *proc = fsRecPtr->fsPtr->listVolumesProc;
if (proc != NULL) {
@@ -3653,6 +3697,7 @@ Tcl_FSListVolumes(void)
}
fsRecPtr = fsRecPtr->nextPtr;
}
+ Disclaim();
return resultPtr;
}
@@ -3692,6 +3737,7 @@ FsListMounts(
*/
fsRecPtr = FsGetFirstFilesystem();
+ Claim();
while (fsRecPtr != NULL) {
if (fsRecPtr->fsPtr != &tclNativeFilesystem) {
Tcl_FSMatchInDirectoryProc *proc =
@@ -3705,6 +3751,7 @@ FsListMounts(
}
fsRecPtr = fsRecPtr->nextPtr;
}
+ Disclaim();
return resultPtr;
}
@@ -3823,6 +3870,7 @@ TclFSInternalToNormalized(
{
FilesystemRecord *fsRecPtr = FsGetFirstFilesystem();
+ Claim();
while (fsRecPtr != NULL) {
if (fsRecPtr->fsPtr == fromFilesystem) {
*fsRecPtrPtr = fsRecPtr;
@@ -3830,6 +3878,7 @@ TclFSInternalToNormalized(
}
fsRecPtr = fsRecPtr->nextPtr;
}
+ Disclaim();
if ((fsRecPtr != NULL)
&& (fromFilesystem->internalToNormalizedProc != NULL)) {
@@ -3942,6 +3991,7 @@ TclFSNonnativePathType(
*/
fsRecPtr = FsGetFirstFilesystem();
+ Claim();
while (fsRecPtr != NULL) {
Tcl_FSListVolumesProc *proc = fsRecPtr->fsPtr->listVolumesProc;
@@ -4020,6 +4070,7 @@ TclFSNonnativePathType(
}
fsRecPtr = fsRecPtr->nextPtr;
}
+ Disclaim();
return type;
}
@@ -4414,6 +4465,7 @@ Tcl_FSGetFileSystemForPath(
*/
fsRecPtr = FsGetFirstFilesystem();
+ Claim();
if (TclFSEnsureEpochOk(pathPtr, &retVal) != TCL_OK) {
return NULL;
@@ -4442,6 +4494,7 @@ Tcl_FSGetFileSystemForPath(
}
fsRecPtr = fsRecPtr->nextPtr;
}
+ Disclaim();
return retVal;
}
generated by cgit v0.12 at 2024-11-04 18:52:53 (GMT)